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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-Day Average Streamflow
 
01672500 SOUTH ANNA RIVER NEAR ASHLAND, VA
LOCATION.--Latitude 37°47'48", Longitude 77°32'57", North American Datum of 1927,
                    Hanover County, VA, Hydrologic Unit 02080106.
DRAINAGE AREA.--395 square miles.
PERIOD OF RECORD.--October 1930 to September 1997, June 2003 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2015.
REGULATION.--Small diurnal fluctuation at low flow in some years caused by mills upstream from station. Since 1966, diversion upstream averaged less than 0.6 cfs. Capacity of the diversion is about 1.5 cfs.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 01672500 plot. SOUTH ANNA RIVER NEAR ASHLAND, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 03/22/2017 is 229.79 cubic feet per second.

  explanation   Percentile Description Duration Plot Description 28 Day 14 Day 7 Day Daily
      Duration Table of 14-Day Average Streamflow
            Flow values in cubic feet per second


                01672500     SOUTH ANNA RIVER NEAR ASHLAND, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
55.4
104
132
250
424
632
965
1,200
2,880
 
79
February
52.8
132
181
288
452
701
1,010
1,260
2,900
 
79
March
97.0
188
247
361
527
774
988
1,280
3,360
 
79
April
108
172
206
306
464
739
1,060
1,320
3,530
 
79
May
87.7
119
143
198
301
473
807
991
3,620
 
79
June
33.5
68.3
81.2
118
190
287
485
671
3,900
 
79
July
19.9
40.0
50.0
74.8
113
206
394
566
3,950
 
79
August
7.43
24.6
29.4
51.3
92.4
190
437
681
4,390
 
80
September
4.86
14.9
19.5
35.1
84.7
170
464
697
4,360
 
80
October
6.73
13.7
21.5
46.2
93.0
197
466
821
2,370
 
78
November
13.0
38.7
51.6
87.7
154
335
600
847
2,400
 
79
December
29.1
65.6
85.8
148
278
498
803
1,080
2,540
 
79
 
       

The current 14-day running-average value for 03/22/2017 is 229.79 cubic feet per second.

---- Provisional Data Subject to Revision ----

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